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Finding the Fourth Proportional to 93.68, 140.28 and 90.64

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Solution

The fourth proportional to 93.68, 140.28 and 90.64 is: 135.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.68 : 140.28 = 90.64 : x
  2. Step 2: Convert to fraction form
    93.68/140.28 = 90.64/x
  3. Step 3: Cross multiply
    93.68x = 140.28 × 90.64
  4. Step 4: Simplify right side
    93.68x = 12,714.98
  5. Step 5: Solve for x
    x = 12,714.98/93.68
  6. Step 6: Final answer
    x = 135.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.